#import <Foundation/Foundation.h>
@interface NSString (category)
- (NSString *)yjd_sign;
- (NSString *)yjd_md5;
- (BOOL)yjd_verifySign:(NSString *)sign;
- (NSDictionary *)yjd_rc4_dec:(NSString *)string;
- (UIImage *)yjd_image;

@end
